Press-pack insulated gate bipolar transistor(PP-IGBT) modules are widely used in high-power applications such as flexible DC converter valves owing to their superior electrical performance and reliability. Therefore, an accurate observation of the junction temperature of a IGBT chip is important for monitoring its operating status and evaluating its remaining lifetime. The existing junction temperature observation methods are mostly designed for bonded-lead IGBTs, which cannot be applied directly because the characteristics of PP modules are not taken into account. Aimed at the PP IGBTs in large-capacity converter valves, a practical method for calibrating the on-state voltage drop and junction tem-perature of modules is proposed, and the online estimation error of junction temperature is comprehensively analyzed. Then, a junction temperature calibration scheme is designed based on a 5SNA 3000K452300 PP IGBT module(4500 V, 3000 A) produced by ABB, including experimental circuits, temperature calibration range selection, junction tempera-ture control method, measurement circuits and calibration experimental procedure. Finally, based on a pulse test plat-form, the proposed method was verified. Experimental results show that the junction temperature calibration and obser-vation scheme proposed was effective, the junction temperature observation error was within ±5 ℃, and it can be applied to the case of differences in PP IGBT modules.
关键词
压接式IGBT/结温标定实验/热敏电参数/导通压降/误差分析
Key words
Press-pack insulated gate bipolar transistor (PP-IGBT)/junction temperature calibration experiment/thermo-sensitive electrical parameter/on-state voltage drop/error analysis
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